import numpy as np
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import pytest
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import pandas as pd
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from pandas import (
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Index,
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TimedeltaIndex,
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timedelta_range,
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)
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import pandas._testing as tm
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from pandas.tseries.offsets import Hour
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class TestTimedeltaIndex:
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def test_union(self):
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i1 = timedelta_range("1day", periods=5)
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i2 = timedelta_range("3day", periods=5)
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result = i1.union(i2)
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expected = timedelta_range("1day", periods=7)
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tm.assert_index_equal(result, expected)
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i1 = Index(np.arange(0, 20, 2, dtype=np.int64))
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i2 = timedelta_range(start="1 day", periods=10, freq="D")
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i1.union(i2) # Works
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i2.union(i1) # Fails with "AttributeError: can't set attribute"
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def test_union_sort_false(self):
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tdi = timedelta_range("1day", periods=5)
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left = tdi[3:]
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right = tdi[:3]
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# Check that we are testing the desired code path
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assert left._can_fast_union(right)
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result = left.union(right)
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tm.assert_index_equal(result, tdi)
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result = left.union(right, sort=False)
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expected = TimedeltaIndex(["4 Days", "5 Days", "1 Days", "2 Day", "3 Days"])
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tm.assert_index_equal(result, expected)
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def test_union_coverage(self):
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idx = TimedeltaIndex(["3d", "1d", "2d"])
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ordered = TimedeltaIndex(idx.sort_values(), freq="infer")
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result = ordered.union(idx)
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tm.assert_index_equal(result, ordered)
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result = ordered[:0].union(ordered)
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tm.assert_index_equal(result, ordered)
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assert result.freq == ordered.freq
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def test_union_bug_1730(self):
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rng_a = timedelta_range("1 day", periods=4, freq="3H")
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rng_b = timedelta_range("1 day", periods=4, freq="4H")
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result = rng_a.union(rng_b)
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exp = TimedeltaIndex(sorted(set(rng_a) | set(rng_b)))
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tm.assert_index_equal(result, exp)
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def test_union_bug_1745(self):
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left = TimedeltaIndex(["1 day 15:19:49.695000"])
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right = TimedeltaIndex(
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["2 day 13:04:21.322000", "1 day 15:27:24.873000", "1 day 15:31:05.350000"]
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)
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result = left.union(right)
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exp = TimedeltaIndex(sorted(set(left) | set(right)))
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tm.assert_index_equal(result, exp)
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def test_union_bug_4564(self):
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left = timedelta_range("1 day", "30d")
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right = left + pd.offsets.Minute(15)
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result = left.union(right)
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exp = TimedeltaIndex(sorted(set(left) | set(right)))
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tm.assert_index_equal(result, exp)
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def test_union_freq_infer(self):
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# When taking the union of two TimedeltaIndexes, we infer
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# a freq even if the arguments don't have freq. This matches
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# DatetimeIndex behavior.
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tdi = timedelta_range("1 Day", periods=5)
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left = tdi[[0, 1, 3, 4]]
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right = tdi[[2, 3, 1]]
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assert left.freq is None
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assert right.freq is None
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result = left.union(right)
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tm.assert_index_equal(result, tdi)
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assert result.freq == "D"
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def test_intersection_bug_1708(self):
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index_1 = timedelta_range("1 day", periods=4, freq="h")
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index_2 = index_1 + pd.offsets.Hour(5)
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result = index_1.intersection(index_2)
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assert len(result) == 0
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index_1 = timedelta_range("1 day", periods=4, freq="h")
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index_2 = index_1 + pd.offsets.Hour(1)
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result = index_1.intersection(index_2)
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expected = timedelta_range("1 day 01:00:00", periods=3, freq="h")
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tm.assert_index_equal(result, expected)
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assert result.freq == expected.freq
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def test_intersection_equal(self, sort):
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# GH 24471 Test intersection outcome given the sort keyword
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# for equal indices intersection should return the original index
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first = timedelta_range("1 day", periods=4, freq="h")
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second = timedelta_range("1 day", periods=4, freq="h")
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intersect = first.intersection(second, sort=sort)
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if sort is None:
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tm.assert_index_equal(intersect, second.sort_values())
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assert tm.equalContents(intersect, second)
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# Corner cases
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inter = first.intersection(first, sort=sort)
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assert inter is first
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@pytest.mark.parametrize("period_1, period_2", [(0, 4), (4, 0)])
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def test_intersection_zero_length(self, period_1, period_2, sort):
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# GH 24471 test for non overlap the intersection should be zero length
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index_1 = timedelta_range("1 day", periods=period_1, freq="h")
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index_2 = timedelta_range("1 day", periods=period_2, freq="h")
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expected = timedelta_range("1 day", periods=0, freq="h")
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result = index_1.intersection(index_2, sort=sort)
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tm.assert_index_equal(result, expected)
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def test_zero_length_input_index(self, sort):
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# GH 24966 test for 0-len intersections are copied
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index_1 = timedelta_range("1 day", periods=0, freq="h")
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index_2 = timedelta_range("1 day", periods=3, freq="h")
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result = index_1.intersection(index_2, sort=sort)
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assert index_1 is not result
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assert index_2 is not result
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tm.assert_copy(result, index_1)
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@pytest.mark.parametrize(
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"rng, expected",
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# if target has the same name, it is preserved
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[
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(
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timedelta_range("1 day", periods=5, freq="h", name="idx"),
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timedelta_range("1 day", periods=4, freq="h", name="idx"),
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),
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# if target name is different, it will be reset
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(
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timedelta_range("1 day", periods=5, freq="h", name="other"),
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timedelta_range("1 day", periods=4, freq="h", name=None),
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),
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# if no overlap exists return empty index
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(
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timedelta_range("1 day", periods=10, freq="h", name="idx")[5:],
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TimedeltaIndex([], freq="h", name="idx"),
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),
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],
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)
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def test_intersection(self, rng, expected, sort):
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# GH 4690 (with tz)
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base = timedelta_range("1 day", periods=4, freq="h", name="idx")
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result = base.intersection(rng, sort=sort)
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if sort is None:
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expected = expected.sort_values()
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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assert result.freq == expected.freq
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@pytest.mark.parametrize(
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"rng, expected",
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# part intersection works
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[
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(
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TimedeltaIndex(["5 hour", "2 hour", "4 hour", "9 hour"], name="idx"),
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TimedeltaIndex(["2 hour", "4 hour"], name="idx"),
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),
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# reordered part intersection
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(
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TimedeltaIndex(["2 hour", "5 hour", "5 hour", "1 hour"], name="other"),
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TimedeltaIndex(["1 hour", "2 hour"], name=None),
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),
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# reversed index
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(
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TimedeltaIndex(["1 hour", "2 hour", "4 hour", "3 hour"], name="idx")[
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::-1
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],
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TimedeltaIndex(["1 hour", "2 hour", "4 hour", "3 hour"], name="idx"),
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),
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],
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)
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def test_intersection_non_monotonic(self, rng, expected, sort):
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# 24471 non-monotonic
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base = TimedeltaIndex(["1 hour", "2 hour", "4 hour", "3 hour"], name="idx")
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result = base.intersection(rng, sort=sort)
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if sort is None:
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expected = expected.sort_values()
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tm.assert_index_equal(result, expected)
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assert result.name == expected.name
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# if reversed order, frequency is still the same
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if all(base == rng[::-1]) and sort is None:
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assert isinstance(result.freq, Hour)
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else:
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assert result.freq is None
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class TestTimedeltaIndexDifference:
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def test_difference_freq(self, sort):
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# GH14323: Difference of TimedeltaIndex should not preserve frequency
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index = timedelta_range("0 days", "5 days", freq="D")
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other = timedelta_range("1 days", "4 days", freq="D")
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expected = TimedeltaIndex(["0 days", "5 days"], freq=None)
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idx_diff = index.difference(other, sort)
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tm.assert_index_equal(idx_diff, expected)
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tm.assert_attr_equal("freq", idx_diff, expected)
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other = timedelta_range("2 days", "5 days", freq="D")
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idx_diff = index.difference(other, sort)
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expected = TimedeltaIndex(["0 days", "1 days"], freq=None)
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tm.assert_index_equal(idx_diff, expected)
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tm.assert_attr_equal("freq", idx_diff, expected)
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def test_difference_sort(self, sort):
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index = TimedeltaIndex(
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["5 days", "3 days", "2 days", "4 days", "1 days", "0 days"]
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)
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other = timedelta_range("1 days", "4 days", freq="D")
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idx_diff = index.difference(other, sort)
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expected = TimedeltaIndex(["5 days", "0 days"], freq=None)
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if sort is None:
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expected = expected.sort_values()
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tm.assert_index_equal(idx_diff, expected)
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tm.assert_attr_equal("freq", idx_diff, expected)
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other = timedelta_range("2 days", "5 days", freq="D")
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idx_diff = index.difference(other, sort)
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expected = TimedeltaIndex(["1 days", "0 days"], freq=None)
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if sort is None:
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expected = expected.sort_values()
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tm.assert_index_equal(idx_diff, expected)
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tm.assert_attr_equal("freq", idx_diff, expected)
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